Continuous distillation of tar.



.l. ARTMANN.

CONTINUOUS DISTILLATION OF TAR.

APPLICATION FILED OCT. 14, 1909.

' Patented Jan. 30,1917. 7

1 IIIIIIZZIII E J'QHANN TMANN, 0F ESSEN-ON-THE-EUHR, GERMANY.

GONTINUQUS DISTILLATION 0F TAR.

Specification of Letters Patent.

Patented Jan. 34), 1191?.

Application filed October 14, i909. Serial No. 522,540.

.stills however, but it is heated preliminarily and supplied at the distillation temperature to'the first still, the waste furnace gases of the stills being used for the preliminary heating. Not only is the cost of working diminished in consequence of improved utilization of heat, but above all it is possible to work really continuously owing to the volatile constituents being now separated in the proper manner, pitch of like nature always leaving apparatus.

One constructional form of apparatus for carrying my process into practice is represented by way of example in the accompanying drawing in which- Figure l is a vertical section and Fig. 2 a plan of the apparatus.

The tar, which is first supplied through the condensers in a well known manner for the purpose of preliminarily heating it, as supplied, after water has first been removed from it, to the system of pipes a inclosed by masonry, in which system it is heated with the aid of the furnace gases flowing from the furnaces of the stills b and a so that it enters into the still I) at a temperature of about 250 C. and here gives off the medium weight and naphthalene oils. lhe tar then flows into still 0, gives 03 the heavy oils and then passes into the non-heated boiler d in which theheavier volatile constituents are distilled off by the steam, so that pure pitch is discharged. The volatile constituents are conducted from the stills b and c and the boiler (Z through the pipes e, f and 9, respectively, into the condensers it, i and h, respectively.

I claim:

1. A method of continuously distilling tar, which consists in preliminarily heating the tar above the distillation temperature of the medium weight and naphthalene oils Without permitting their distillation, then con-' tinuously distilling off said medium weight and naphthalene oils, continuously conducting away the residue of said tar from said region of distillation, then continuously distilling off the heavy oils in said residue, and continuously conducting awa from the region of said second distillation the second residue of said tar remaining after said second distillation, and continuously removing from said second residue the heavier volatile constituents thereof, and continuously conducting away the pitch thus remaining, the said heat thus preliminarily imparted to the tar before the distillation thereof being suflicient to enable the said continuous distillation, substantially as described.

2. A method of continuously distilling tar,

which consists in preliminarily heating thev tar to 250 C., then continuously, distilling oii from said tar the medium weight and naphthalene oils contained therein, continuously conducting away the residue of said ta rfrom said region of distillation, then continuously distilling 0d the heavy oils in said residue, and continuously conducting away from the region of said second distlllation the second residue of said tar remaining after said second distillation, and continuously removin from said second residue the heavier volati e constituents thereof, and continuously conducting away the pitch thus remaining, said tar being heated only before the distillation of the said medium and naphthalene oils, the said heat preliminarily imparted to the tar being sufficient to enable the said continuous distillation, substantially as described.

3. A method of continuously distilling tar, which consists in first dehydrating the tar, preliminarily heating the tar above the distillation temperature of the medium weight and naphthalene oils without permitting the distillation thereof, then continuously distilling ofi' said medium weight and naphthalene oils, continuously conducting away the residue of said tar from said region of distillation, then continuously distilling ofi the heavy oils in said residue, and continuously conducting away from the region of said second distillation the second residue of said tar remaining after said second distillation,

and continuously removing from said second residue the heavier volatile constituents thereof, and continuously conducting away the pitch thus remaining, the said heat imparted to'thesaid tar before the commenceimparted to the residues thereof said regions of distillation being sufiicient for all the distillations thereof, substantially as described.

4. A method of continuously distilling tar, which consists in first dehydrating the tar, preliminarily heating the tar to 250 C., then continuously distilling off the medium Weight and naphthalene oils Without permittin'g the distillation thereof, continuously conducting away the residue of said tar from said 1' 'on of distillation, then continuously distilling ofi the heavy oils in said residue,

and continuously conducting away from the region of said second distillation the second residue ofsai'd ta'r remaining after said sec- 'ond' distillation, and continuously removing ment of the first distillation,- plus the" heat from said second residue the heavier volatile constituents thereof, and continuously conducting away the pitch thus remaining, the said. heat imparted to the said tar before the commencement of the'first distillation, plus the heat imparted to the residue thereof in said regions of distillation being suficient for all the distillations thereof, substantially as described.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

I JO HANN ARTMANN.

Witnesses: I

HENRY LANDRIEURE, FRIEDRICH STEITZ. 

